Wireless communication system and wireless terminal device

ABSTRACT

A wireless communication system includes a terminal capability information reception unit to receive and extract terminal capability information, the terminal capability information indicating at least one of an uplink frequency bandwidth as a capability of a wireless terminal device and a downlink frequency bandwidth as a capability of the wireless terminal device; a terminal category setting unit to identify a terminal category to which the wireless terminal device belongs, based on the terminal capability information; and a link setting unit to set a link between a base station and the wireless terminal device and to transmit a control signal depending on the link setting between the base station and the wireless terminal device, based on the terminal category set by the terminal category setting unit.

CROSS REFERENCE TO RELATED APPLICATION

The present application is a continuation of U.S. application Ser. No.13/356,195, filed Jan. 23, 2012, now pending which is a divisional ofU.S. application Ser. No. 12/437,827, filed on May 8, 2009, now U.S.Pat. No. 8,923,213 B2, issued Dec. 30, 2014, which is a continuation ofinternational PCT application No. PCT/JP2006/322494 filed, on Nov. 10,2006, the contents of each are herein wholly incorporated by reference.

TECHNICAL FIELD

The present invention relates to the technology of wirelesscommunications using a terminal device having at least one of a firstfrequency bandwidth for use in an up link and its central frequency anda second frequency bandwidth for use in an down link and its centralfrequency is variable.

BACKGROUND ART

Recently, a higher communication speed is demanded in the wirelesscommunications. In a mobile communication service such as a mobiletelephone etc., a high-speed broad band communication system has beenstudied at the demand or a higher speed communication. A W-CDMA(wideband-code division multiple access) system has been studied andstandardized in a 3GPP (3rd generation partnership project) as one ofthe communication systems.

Described below is an example of the W-CDMA system. The W-CDMA system isconfigured by a terminal device (UE: user equipment) such as a mobiletelephone, a vehicle-mounted telephone, etc., a plurality of wirelessbase station (node B) for communicating with the terminal device(hereinafter referred to as a “terminal”), and a radio networkcontroller (RNC: radio network controller) for controlling the pluralityof wireless base station (hereinafter referred to as “base station”)(FIG. 5).

In the above-mentioned W-CDMA system, communications can be realized ina higher speed by broad bands using FDD (frequency division duplex) orTDD (time division duplex), and an independent frequency resource isrespectively assigned to the up/down link in the FDD mode. The frequencyband available for the uplink (up link frequency band), and thefrequency band available for the downlink (down link frequency band) areregulated by laws (the Radio Law etc.). For example, in the service ofthe 2 GHz band provided in Japan, the bandwidths are fixed to 5.0 MHz,and the frequency difference between the up and down bands is 190 MHzconstantly. Therefore, in the W-CDMA method using the W-CDMA system,when one of the up and down link frequency bands is selected, the othercan be determined from the frequency difference. That is, a terminal isto be informed of the determined down link frequency (band) only.

FIG. 1 is an explanatory view of the frequency information transmittedand received between the base station and the terminal regulated in thenon-patent document 3 as one of the specifications of the W-CDMA system.As illustrated in FIG. 1, a notification of the down link frequencyinformation (represented as “UARFCN downlink (Nd)” in FIG. 1. UARFCN isshort for UTRA absolute radio frequency channel number) to the mobilecommunication device is necessary (MP), and the up link frequencyinformation (represented as “UARFCN uplink (Nu)” in FIG. 1) is optional(OP). When the frequency difference is not constant (fixed), anotification of the up link frequency information is required (MP). Thedown link frequency is determined by the radio network controller, andreported to the terminal through the base station.

Since the information about the up link frequency is Nu, the informationabout the down link frequency is Nd, and the setting range is 0 through16383, 14 bits are required for the representation. Therefore, a 14-bitcontrol signal is transmitted to the terminal.

The frequency information Nu, and Nd is regulated in the non-patentdocument 1, and generated by the following equations.

Nu=5×(F _(UL) −F _(UL) _(_) _(offset))  (1)

Nd=5×(F _(DL) −F _(DL) _(_) _(offset))  (2)

where F_(UL) and F_(DL) are determined frequencies, and F_(UL) _(_)_(offset) and F_(DL) _(_) _(offset) are offset frequencies regulated inFIG. 2. Therefore, FIG. 2 is an explanatory view of the frequency foreach frequency band, and is a table described in the non-patent document1 with additional columns of the central frequency of the up and downlink bands and the difference between the up and down link frequencies.

The “i” through “ix” in FIG. 2 indicate the respective frequency bandnumbers. Thus, FIG. 2 illustrates the bands assigned to the uplink (UL:link transmitted from the terminal (UE) to the base station (node B))and the downlink (DL: link transmitted from the base station to theterminal)) for each frequency band, and the frequency difference betweenthe bands.

The frequency information Nu and Nd are calculated as follows by usingthe equations above when the up link frequency is 1922.4 MHz and thedown link frequency is 2112.4 MHz.

Nu=5×(F _(UL) −F _(UL) _(_) _(offset))=5×(1922.4−0)=9612  (3)

Nd=5×(F _(DL) −F _(DL) _(_) _(offset))=5×(2112.4−0)=10562  (4)

In the W-CDMA system, the capability (terminal capability) of a terminalis categorized. A terminal capability refers to essential informationfor communications such as the number of wireless channels available fora broadcast. By classifying the capability into categories using theinformation, the capability can be more easily managed. For example,FIG. 3 is an explanatory view of categorizing the capability in theconventional HSDPA (high-speed downlink packet access) system describedin the non-patent document 3, and FIG. 4 is an explanatory view ofcategorizing the capability in the HSUPA (high-speed uplink packetaccess) system described in the non-patent document 3. The HSDPA and theHSUPA systems are operated at a higher speed than the W-CDMA system.FIG. 3 illustrates for each category the determined maximum number ofHS-DSCH (high-speed downlink shared channels) that can be simultaneouslyreceived, minimum transmission time interval (minimum inter-TTIinterval) that can be intermittently received, maximum number of bits ofthe HS-DSCH transmission blocks, and total number of bits of softchannels. FIG. 4 illustrates for each category the determined maximumnumber of E-DCH (enhanced-dedicated channels) that can be simultaneouslytransmitted, minimum SF (spreading factor), transmitting time interval(TTI) (TTI is 10, and 2 ms) of the supported E-DCH, maximum number ofbits of E-DCH transmission blocks transmitted at the TTI of 10 ms, andmaximum number of bits of E-DCH transmission blocks transmitted at theTTI of 2 ms.

As described above, a category is inevitable information forappropriately perform communications between a base station and aterminal. Accordingly, category information (for example, a categorynumber) or terminal capability information is notified from a terminalto a base station. The notification is reflected by the scheduling forselecting a communication partner and determining a transmitting method.

Recently proposed is a communication system having practically availablefrequency bandwidth (hereinafter referred to as an “up bandwidth”) anddown link frequency bandwidth (hereinafter referred to as a “downbandwidth”) not only separate from each other but also variabledepending on the terminal capability. For example, it is an E3G (evolved3G also referred to as S3G (super 3G)) system studied for specificationsin the 3GPP system.

The frequency difference between the up and down links in the E3G systemdepends on the assignment of each bandwidth and the central frequency ofeach band. Therefore, unlike the conventional W-CDMA system, it cannotautomatically select the up link frequency by selecting the down linkfrequency. That is, the settings of the up and down frequencies are tobe separately performed, thereby requiring a larger volume of necessarycontrol information, complicating the controlling operation, and forcingthe base station to notify the terminal of the control information aboutthe up and down frequencies.

Since the frequency setting can be changed even during communications bya propagation environment, scheduling, etc., it is necessary to set afrequency at a high speed. To set a frequency at a high speed, it isimportant to realize at least one of the process of reducing the numberof pieces of control information to be transmitted and received, or theprocess of simplifying the control. Since 14 bits are required for thenotification of each of the frequency information Nu and Nd obtained bythe equations (1) and (2) above, it is conventionally considered thatthe frequency information Nu and Nd are to be transmitted to theterminal by a smaller number of bits.

-   Patent Document 1: Japanese Laid-open Patent Publication No.    2005-341432-   Patent Document 2: Japanese Laid-open Patent Publication No.    2000-69544-   Patent Document 3: Japanese Laid-open Patent Publication No.    2000-175254-   Non-patent Document 1: 3GPP TS 25.101 V7.4.0 (2006-06)-   Non-patent Document 2: 3GPP TS 25.306 V6.8.0 (2006-06)-   Non-patent Document 3: 3GPP TS 25.331 V6.10.0 (2006-06)

DISCLOSURE OF THE INVENTION

The present invention aims at providing the technology of setting afrequency at a high speed in wireless communications (mobilecommunications).

The first and second wireless communication systems according to thepresent invention are to communicate with a wireless terminal device(hereinafter referred to as a “terminal”), and each of the systems hasthe following devices.

The wireless communication system according to the first aspect includesa category designation unit for designating a terminal category using atleast the transmitting frequency bandwidth and receiving frequencybandwidth available between the system and a wireless terminal device.

The wireless communication system according to the second aspectincludes a category designation unit for designating a terminal categoryusing a difference between a transmitting frequency and a receivingfrequency available between the system and a wireless terminal device.

The wireless communication systems according to the third throughfourteenth aspects correspond to a terminal in which at least one of afirst frequency bandwidth (and its central frequency) for use in an uplink and a second frequency bandwidth (and its central frequency) foruse in a down link is variable, and each system includes the followingunits.

The terminal according to the first through fourth aspects is based onthat at least one of a first frequency bandwidth (and its centralfrequency) for use in an up link and a second frequency bandwidth (andits central frequency) for use in a down link is variable, and includesthe following units.

The wireless communication system according to the third aspectincludes: a capability information reception unit for receiving andextracting terminal capability information transmitted from a terminaland related to the capability of the terminal; a category designationunit for designating a terminal category to which the terminal belongs,based on the terminal capability information received and extracted bythe capability information reception unit; and a link setting unit forsetting a link to the wireless terminal device and transmitting acontrol signal depending on the link setting to the wireless terminaldevice, based on the terminal category designated by the categorydesignation unit.

The wireless communication system according to the fourth aspectincludes: a capability information reception unit for receiving andextracting terminal capability information transmitted from a terminaland related to terminal capability; a category designation unit fordesignating a terminal category to which the terminal belongs, based onthe terminal capability information received and extracted by thecapability information reception unit; and a scheduling unit forscheduling on the basis of the terminal category designated by thecategory designation unit for selecting a terminal to communicate withfrom among the terminals.

The wireless communication system according to the fifth aspectincludes: a category information reception unit for receiving andextracting terminal category information transmitted from a terminal andindicating a terminal category to which the terminal belongs; and a linksetting unit for setting a link to the terminal according to theterminal category information received and extracted by the categoryinformation reception unit, and transmitting a control signalcorresponding to the link setting to the terminal.

The wireless communication system according to the sixth aspectincludes: a category information reception unit for receiving andextracting terminal category information transmitted from a terminal andindicating a terminal category to which the terminal belongs; and ascheduling unit for scheduling according to the terminal categoryinformation received and extracted by the category information receptionunit for selecting a terminal to communicate with from among theterminals.

The wireless communication system according to the seventh aspectfurther includes in addition to the configuration according to an of thethird through sixth aspects: a control signal transmission unit forgenerating a control signal indicating a frequency after a change of afrequency used in communications with a terminal using a frequencydifference between frequencies before and after the change and notifyingthe terminal of the frequency after the change by transmitting thecontrol signal to the terminal.

The wireless communication system according to the eighth aspectincludes: a link setting unit for setting a link to a terminal; and acontrol signal transmission unit for generating a control signal usingboth one of a down link frequency indicating a down link frequency bandand an up link frequency indicating an up link frequency band determinedby the link setting unit determining the link setting, and anotherfrequency represented by a frequency difference between the down linkfrequency and the up link frequency, and transmitting the signal to awireless terminal device, thereby informing of the down link frequencyand the up link frequency.

The terminal according to the first aspect is based on the wirelesscommunication system of the eighth aspect. With the configuration, theterminal further includes: a control signal reception unit for receivingfrom the wireless communication system which communicates with theterminal the control signal generated and transmitted using both one ofa down link frequency indicating a down link frequency band and an uplink frequency indicating an up link frequency band determined by thewireless communication system, and another frequency represented by afrequency difference between the down link frequency and the up linkfrequency; and a device setting unit for designating the up linkfrequency and the down link frequency on the basis of the control signalreceived by the control signal reception unit, and setting a terminal.

The wireless communication system according to the ninth aspectincludes: a link setting unit for setting a link to a terminal; and acontrol signal transmission unit for defining at least one of a downlink frequency indicating a down link frequency band and an up linkfrequency indicating an up link frequency band determined by the linksetting unit setting the link as a one frequency, by generating acontrol signal using reference frequency information indicating thereference frequency predetermined as a reference and a frequencydifference between the reference frequency and the one frequency, andtransmitting the signal to the wireless terminal device.

The wireless communication system according to the tenth aspectincludes: a link setting unit for setting a link to a terminal; and acontrol signal transmission unit for generating a control signal using afrequency difference between at least one of a down link frequencyindicating a down link frequency band and an up link frequencyindicating an up link frequency band determined by the link setting unitsetting the link as one frequency and a reference frequency defined as areference in advance, and transmitting the signal to the terminal,thereby reporting the one frequency.

The terminal according to the second aspect is based on the wirelesscommunication system of the ninth or tenth aspect, and includes: acontrol signal reception unit for receiving from the wirelesscommunication system according to the ninth or tenth aspect the controlsignal generated and transmitted using reference frequency informationindicating a reference frequency determined as a reference in advance,and a frequency difference between one of a down link frequencyindicating a down link frequency band and an up link frequencyindicating an up link frequency band determined by the wirelesscommunication system as one frequency and the reference frequency; and adevice setting unit for designating one frequency according to thecontrol signal received by the control signal reception unit and settinga terminal.

The wireless communication system according to the eleventh aspectincludes: a link setting unit for setting a link to a terminal byassuming subcarriers having different frequencies; and a control signaltransmission unit for generating a control signal according tosubcarrier information indicating a subcarrier belonging to at least oneof a down link frequency band and an up link frequency band determinedby the link setting when the link setting unit sets the link,transmitting the signal to the terminal, thereby notifying the terminalof the one frequency.

The wireless communication system according to the twelfth aspectincludes: a scheduling unit for scheduling selecting a terminal tocommunicate with from among a plurality of terminals; and a controlsignal transmission unit for notifying the terminal selected by thescheduling unit by performing the scheduling using subcarriers havingdifferent frequencies at least one of down link frequency band and an uplink frequency band determined by performing the scheduling as onefrequency, by generating and transmitting a control signal usingsubcarrier information indicating a subcarrier belonging to the onefrequency.

The terminal according to the third aspect is based on the wirelesscommunication system according to the eleventh or twelfth aspect, andincludes: a control signal reception unit for receiving from thewireless communication system which communicates with the terminal acontrol signal generated and transmitted using subcarrier informationindicating a subcarrier belonging to one frequency to notify of at leastone of a down link frequency band and an up link frequency banddetermined by the wireless communication system by assuming subcarriershaving different frequencies; and a device setting unit for designatingone frequency and bandwidth according to the control signal received bythe control signal reception unit, and setting a terminal.

The wireless communication system according to the thirteenth aspectincludes: a link setting unit for setting a link to a terminal; and acontrol signal transmission unit for dividing subcarriers havingdifferent frequencies into groups configured by a plurality ofsubcarriers, and notifying a terminal for which the link setting unitsets a link of one frequency by generating and transmitting a controlsignal according to group information indicating a group correspondingto at least one of a down link frequency band and an up link frequencyband determined by setting the link.

The wireless communication system according to the fourteenth aspectincludes: a scheduling unit for scheduling of selecting a terminal tocommunicate with from among the terminals; and a control signaltransmission unit for dividing subcarriers having different frequenciesinto groups configured by a plurality of subcarriers, and notifying theterminal selected by the scheduling unit performing the scheduling bygenerating and transmitting a control signal according to groupinformation indicating a group corresponding to at least one of the downlink frequency band and an up link frequency band determined byperforming the scheduling.

The terminal according to the fourth aspect is based on the wirelesscommunication system of the thirteenth or fourteenth aspect includes: acontrol signal reception unit for dividing subcarriers having differentfrequencies into groups configured by a plurality of subcarriers andreceiving from the wireless communication system communicating with theterminal a control signal generated and transmitted using groupinformation indicating a group corresponding to one frequency to notifythe terminal of at least one of the down link frequency band and the uplink frequency band determined by the wireless communication system; anda device setting unit for designating a frequency and a bandwidth of onefrequency according to the control signal received by the control signalreception unit and setting the terminal.

In the present invention, a terminal category is designated by thewireless communication system by a terminal transmitting terminalcapability information associated with a terminal category or terminalcategory information indicating the terminal category, a link setting isperformed between the system and the terminal on the basis of thedesignated terminal category, and a control signal (information)corresponding to the link setting is transmitted to the terminal. Thelink setting (frequency setting in wireless communications) is performedwith a possible setting range for one or more setting items associatedwith the terminal category restricted. With the restriction, thefrequency setting can be simplified. Therefore, the frequency settingitself can be performed in a higher speed. It holds true with thefrequency setting accompanied with the scheduling. The terminalcapability information indicates the contents of at least one of thesetting items, and can be, for example, at least one of a frequencybandwidth that can be received by the terminal (transmitting frequencybandwidth) and a frequency bandwidth that can be transmitted by theterminal (receiving frequency bandwidth), or a difference between thefrequencies that can be transmitted and received by the terminal(difference between the transmitting frequency and the receivingfrequency).

According to the present invention, when the link setting between thesystem and the terminal or the frequency setting by the scheduling isperformed, a control signal (information) is generated using one of thedown link frequency indicating the down link frequency band and the uplink frequency indicating the up link frequency band determined by thefrequency setting, and the other represented by the frequency differencebetween the down link frequency and the up link frequency, and thesignal is transmitted to the terminal. The number of bits required torepresent the frequency difference can be smaller than the number ofbits required to represent the up link frequency or the down linkfrequency. Therefore, the number of bits for the control signal(information) can be smaller. Thus, the frequency setting can be easilyperformed at a higher speed.

It is also true in the case where at least one of the down linkfrequency indicating the down link frequency band and the up linkfrequency indicating the up link frequency band determined by afrequency setting is notified by generating a control signal(information) using reference frequency information indicating areference frequency predetermined as a reference and a frequencydifference between the reference frequency and the one of thefrequencies, and transmitting the signal to the terminal, and in thecase where it is notified by generating a control signal (information)using a frequency difference between at least one of the down linkfrequency and the up link frequency and a predetermined referencefrequency as a reference, and transmitting the signal to the terminal.

According to the present invention, when a link is set or a frequency isset by performing scheduling, one of the down link frequency indicatingthe down link frequency band or the up link frequency indicating the uplink frequency band determined by the frequency setting usingsubcarriers having different frequencies is notified by generating acontrol signal (information) using subcarrier information (for example,a number assigned to a subcarrier) indicating a subcarrier belonging tothe one frequency and transmitting the signal to the terminal. Bypreparing the information designating the correspondence between thesubcarrier information and the frequency, the corresponding frequencycan be easily designated from the subcarrier information. The subcarrierinformation itself can be represented generally by a smaller number ofbits than the case where the determined frequency is notified as acontrol signal (information). Therefore, a control signal (information)can come from a smaller number of bits, thereby easily realizing ahigh-speed frequency setting.

According to the present invention, when a link is set or a frequency isset by performing scheduling, subcarriers having different frequenciesare divided into groups configured by a plurality of subcarriers, andthe wireless terminal device that has set the frequency is notified ofat least one of the determined down link frequency band and up linkfrequency band by generating a control signal (information) using groupinformation indicating a group corresponding to the one frequency andtransmitting the signal. Each of the frequency bandwidth and theposition of the bandwidth (frequency) are determined for each group.Therefore, by preparing the information about the correspondingfrequency bandwidth and the position of the bandwidth for each group,the frequency bandwidth and its position can be designated from thegroup information. This implies that the number of pieces of theinformation to be notified to the terminal is reduced. Without groupingin detail, the number of bits required to represent the groupinformation can be largely reduced than in transmitting a notificationby a control signal (information). Thus, it is easier than setting afrequency at a higher speed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an explanatory view of frequency information conventionallytransmitted and received between a base station and a terminal;

FIG. 2 is an explanatory view of a frequency difference for eachfrequency band;

FIG. 3 is an explanatory view of a conventional categorizing process inthe HSDPA (high-speed downlink packet access) system;

FIG. 4 is an explanatory view of a conventional categorizing process inthe HSUPA (high-speed uplink packet access) system;

FIG. 5 illustrates a configuration of a wireless communication systemaccording to the first embodiment of the present invention;

FIG. 6 illustrates the configuration of the wireless communicationdevice mounted in a terminal capable of using the wireless communicationsystem according to the first embodiment of the present invention;

FIG. 7 illustrates the configuration of the device setting control unitof the wireless communication device mounted in a terminal capable ofusing the wireless communication system according to the firstembodiment of the present invention;

FIG. 8 illustrates the configuration of the wireless communicationdevice mounted in a base station configuring the wireless communicationsystem according to the first embodiment of the present invention;

FIG. 9 illustrates the configuration of the link setting unit thewireless communication device mounted in a base station configuring thewireless communication system according to the first embodiment of thepresent invention;

FIG. 10 is an explanatory view of the terminal capability informationassociated with the terminal category according to the first embodimentof the present invention;

FIG. 11 illustrates the configuration of a variation of the wirelesscommunication device mounted in a terminal capable of using the wirelesscommunication system according to the first embodiment of the presentinvention;

FIG. 12 illustrates the configuration of the wireless communicationdevice mounted in a terminal capable of using the wireless communicationsystem according to the second embodiment of the present invention;

FIG. 13 illustrates the configuration of the wireless communicationdevice mounted in a base station configuring the wireless communicationsystem according to the second embodiment of the present invention;

FIG. 14 illustrates the configuration of the wireless communicationdevice wireless communication device mounted in a terminal capable ofusing the wireless communication system according to the fourthembodiment of the present invention;

FIG. 15 illustrates the configuration of the wireless communicationdevice mounted in a base station configuring the wireless communicationsystem according to the fourth embodiment of the present invention;

FIG. 16 illustrates an example of numbering to the subcarriers;

FIG. 17 is an explanatory view of grouping a subcarrier;

FIG. 18 is an explanatory view of a variation of the terminal capabilityinformation associated with the terminal category according to the firstembodiment of the present invention; and

FIG. 19 is an explanatory view of the state in which an availablefrequency band is moved.

BEST MODE FOR CARRYING OUT THE INVENTION

The embodiments of the present invention are described below in detailwith reference to the attached drawings.

First Embodiment

FIG. 5 illustrates a configuration of a wireless communication systemaccording to the first embodiment of the present invention. The wirelesscommunication system corresponds to, for example, the E3G system, thatis, realizes a mobile communication service corresponding to the OFDMA(orthogonal frequency division multiple access). As illustrated in FIG.5, a plurality of wireless base stations (node B hereinafter referred tosimply as a “base station”) 51 for communicating with a mobile terminaldevice (UE (user equipment) hereinafter referred to simply as a“terminal”) are provided to control the terminal 52 by a radio networkcontroller (RNC) 53.

FIG. 6 illustrates the configuration of the wireless communicationdevice mounted in the terminal. As illustrated in FIG. 6, the wirelesscommunication device includes: an antenna 61, two wireless units 62 and63, a coding/modulating unit 64, a demodulating/decoding unit 65, aterminal capability information storage unit 66 storing terminalcapability information, a terminal information signal generation unit67, a control signal extraction unit 68, and a device setting controlunit 69. Hereafter, it is represented with “66” to clarify the storagefor the terminal capability information.

The transmission data to be transmitted is encoded and modulated by thecoding/modulating unit 64. An RF signal obtained by the modulation istransmitted from the antenna 61 through the wireless unit 62.

On the other hand, only the signal portion of the down bandwidthselected by the wireless unit 63 of the RF signal received by theantenna 61 is extracted, and transmitted to the demodulating/decodingunit 65. The demodulating/decoding unit 65 demodulates and decodes theRF signal from the wireless unit 63, and the obtained data is output asreceived data.

FIG. 7 illustrates the configuration of the device setting control unit.As illustrated in FIG. 7, the device setting control unit 69 includes amodulation/demodulation method and coding/decoding method calculationunit 71, a transmission/reception frequency calculation unit 72, atransmission/reception bandwidth calculation unit 73, a demodulatingmethod and decoding method setting unit 74, a receiving use frequencysetting unit 75, a receiving use bandwidth setting unit 76, atransmitting use bandwidth setting unit 77, a transmitting use frequencysetting unit 78, and a modulating method and coding method setting unit79.

FIG. 8 illustrates the configuration of the wireless communicationdevice mounted in the base station. As illustrated in FIG. 8, thecondition device includes an antenna 81, two wireless units 82 and 83, ademodulating/decoding unit 85, a coding/modulating unit 84, a terminalinformation extraction unit 86, and a control signal generation unit 88.A link setting unit 87 and a terminal category setting unit 101 areprepared at the base station 51 (at the wireless communication system),but can be mounted in any of the base station 51 and the radio networkcontroller 52. The wireless communication system according to thepresent embodiment can be realized by preparing the wirelesscommunication device illustrated in FIG. 8.

The transmission data to be transmitted is encoded and modulated by thecoding/modulating unit 85. An RF signal obtained by the modulation istransmitted from the antenna 81 through the wireless unit 83

On the other hand, the RF signal received by the antenna 81 is extractedby the wireless unit 83 for each of the frequency bandwidth, andtransmitted to the demodulating/decoding unit 84. Thedemodulating/decoding unit 84 demodulates and decodes the RF signal fromthe wireless unit 83. The obtained data is output as received data.

FIG. 9 illustrates the configuration of the link setting unit. Asillustrated in FIG. 9, the link setting unit 87 includes amodulation/demodulation method and coding/decoding method calculationunit 91, a transmission/reception frequency calculation unit 92, atransmission/reception bandwidth calculation unit 93, a modulatingmethod and coding method setting unit 94, a transmitting use frequencysetting unit 95, a transmitting use bandwidth setting unit 96, areceiving use bandwidth setting unit 97, a receiving use frequencysetting unit 98, and a demodulating method and decoding method settingunit 99.

The terminal 52 is classified by a terminal category corresponding tothe E3G. The actually used up link frequency bandwidth (hereinafterreferred to as a “up bandwidth”) and down link frequency bandwidth(hereinafter referred to as a “down bandwidth”) can be separately set.Since the up link frequency band and the down link frequency band dependon their bandwidths, the information about the bands is required foreach band in addition to the information about each bandwidth.Accordingly, as compared with the case where each bandwidth is constant,necessary control information increases, thereby complicating thecontrol. In the present embodiment, the complicated control can besuppressed as follows. As the information about bands, the centralfrequency of the each band is conveniently assumed. The information canbe varied if the frequency band can be designated. For example, it canbe the minimum or maximum frequency.

FIG. 10 is an explanatory view of the terminal capability informationassociated with the terminal category according to the presentembodiment of the invention.

In the present embodiment, as illustrated in FIG. 10, a modulationsystem, a down bandwidth, an up bandwidth, and a maximum frequencydifference between the bands are determined with the terminal categoryassociated. In the terminal 52, at least one of a modulation system, anup bandwidth, a down bandwidth, and the maximum frequency difference isprepared as the terminal capability information 66, and the information66 is converted into transmission data (terminal information signal) bythe terminal information signal generation unit 67, and transmitted tothe base station 51 using a predetermined channel. In this example, theinformation illustrated in FIG. 10 is conveniently referred to asintegrated terminal category information.

The number of contents of each piece of the associated information asillustrated in FIG. 10 is 2 for the modulation system, and 3 for each ofthe up/down bandwidth and the maximum frequency difference. Therefore,the terminal capability information 66 of the modulation system can betransmitted as 1-bit information. Other information can be transmittedas 2-bit information.

As illustrated in FIG. 7, the demodulating/decoding unit 65 includes ademodulation unit 65 a and a decoding unit 65 b. The coding/modulatingunit 64 includes a modulation unit 64 a and a coding unit 64 b. Theterminal capability information 66 is transmitted to each of thecalculation units 71 through 73 configuring the device setting controlunit 69. Thus, the modulation/demodulation method and coding/decodingmethod calculation unit 71 determines a demodulating method and adecoding method from the terminal capability information 66, controlsthe demodulation unit 65 a and the decoding unit 65 b through thedemodulating method and decoding method setting unit 74, determines amodulating method and a coding method, and controls the modulation unit64 a and the coding unit 64 b through the modulating method and codingmethod setting unit 79. Similarly, the transmission/reception frequencycalculation unit 72 calculates the down link frequency (receiving usefrequency (central frequency of available down link frequency band)) andthe up link frequency (central frequency of available up link frequencyband). The receiving use frequency setting unit 75 generates a settingsignal of an oscillation frequency of the local oscillator in thewireless unit 63, and controls the wireless unit 63, by based on thecalculation result of the down link frequency. Similarly, on the basisof the up link frequency calculation result, the transmitting usefrequency setting unit 78 generates a setting signal of the oscillationfrequency of the local oscillator in the wireless unit 62, and controlsthe wireless unit 62, by based on the calculation result of the up linkfrequency. The transmission/reception bandwidth calculation unit 73calculates a down bandwidth and an up bandwidth from the control signal.On the basis of the calculated reception bandwidth, the receiving usebandwidth setting unit 76 calculates the setting signal of the filter ofthe wireless unit 63 and the filter in the demodulation unit 65 a, andcontrols wireless unit 63 and the demodulation unit 65 a. Furthermore,the setting signal of the FFT in the demodulation unit 65 a iscalculated, and the demodulation unit 65 a is controlled. On the basisof the similarly calculated transmission bandwidth, the transmitting usefrequency setting unit 78 calculates the setting signal of the firmwarein the modulation unit 64 a in the wireless unit 62, and controls thesetting signal of the FFT unit in the modulation unit 64 a and controlsthe modulation unit 64 a.

As illustrated in FIG. 8, the terminal capability information 67transmitted to the base station 51 through the terminal informationsignal generation unit 67 is received and demodulated and decoded, andoutput as received data by the demodulating/decoding unit 84. Theterminal information extraction unit 86 extracts the terminal capabilityinformation 66 stored in the received data, and transmits theinformation to the terminal category setting unit 101. The setting unit101 includes a storage unit storing integrated terminal categoryinformation as illustrated in FIG. 10. Therefore, by referring to theintegrated terminal category information using the extracted terminalcapability information 66, the terminal category to which the terminal52 that has transmitted the terminal capability information 66 belongsis designated, and the result is notified to the link setting unit 87.The link setting unit 87 sets a link for the terminal 52 according tothe notified terminal category, and generates a control signal bynotifying the control signal generation unit 88 of the controlinformation to be transmitted to the terminal 52, and transmits thesignal.

As illustrated in FIG. 9, the coding/modulating unit 85 includes amodulation unit 85 a and a coding unit 85 b, and thedemodulating/decoding unit 84 includes a demodulation unit 84 a and adecoding unit 84 b. The link setting unit 87 has basically the sameconfiguration as the device setting control unit 69 illustrated in FIG.7. The terminal category designated by the terminal category settingunit 101 is transmitted to each of the calculation units 91 through 93configuring the link setting unit 87. Thus, the modulation/demodulationmethod and coding/decoding method calculation unit 91 determines ademodulating method and a decoding method from the terminal category,controls the modulation unit 85 a and the coding unit 85 b through themodulating method and coding method setting unit 94, determines thedemodulating method and the decoding method, and controls thedemodulation unit 84 a and the decoding unit 84 b through thedemodulating method and decoding method setting unit 99. Similarly, thetransmission/reception frequency calculation unit 92 determines a downlink frequency (receiving use frequency (central frequency of availabledown link frequency band)) and an up link frequency (transmitting usefrequency (central frequency of available uplink frequency band)),thereby controlling the wireless unit 83 through the transmitting usefrequency setting unit 95, and controlling the wireless unit 82 throughthe receiving use frequency setting unit 98. The transmission/receptionbandwidth calculation unit 93 determines the down bandwidth and the upbandwidth, thereby controlling the wireless unit 93 and the modulationunit 85 a through the transmitting use bandwidth setting unit 96, andcontrolling the wireless unit 82 and the demodulation unit 84 a throughthe receiving use bandwidth setting unit 97.

Each of the calculation units 91 through 93 notifies the control signalgeneration unit 88 of the information about the determined contents ascontrol information. Thus, the control information necessary forcommunications is transmitted to the terminal 52.

As illustrated in FIG. 7, the control information transmitted from thebase station 51 is received, demodulated and decoded, and output asreceived data from the demodulating/decoding unit 65. The control signalextraction unit 68 extracts the control information stored in thereceived data and transmitted to the device setting control unit 69.Thus, after receiving the control information, the device settingcontrol unit 69 controls each unit according to the control information.

As described above, according to the present embodiment, a terminalcategory is associated with information not originally included, and theassociated information is reflected by the link setting. The contents ofthe associated information are limited to the scope of theclassification by the terminal category. Therefore, the management ofthe terminal can be more easily performed, and the control can besimplified. As a result, frequency setting such as link setting etc. canbe performed at a higher speed.

In the present embodiment, the terminal capability information 66 istransmitted to the base station 51, but a terminal category can benotified instead of the terminal capability information 66. Thenotification can be realized by, as illustrated in FIG. 11, preparing aterminal category setting unit 111 for designating and setting aterminal category from the terminal capability information 66, andcontrolling the terminal information signal generation unit 67 and thedevice setting control unit 69.

A number of combinations of up/down bandwidths is large. For example,when 1.25 MHz, 2.5 MHz, and 5.0 MHz are assumed as up bandwidths, 5.0MHz, 10 MHz, and 20 MHz are assumed as down bandwidths, and down 20 MHzand up 5 MHz are assumed as the bandwidth of the entire system, thefollowing 63 combinations can be assumed in the 2 GHz.

4×(4+2+1)+2×(4+2+1)+1×(4+2+1)=9×7=63

In Japan, as illustrated in FIG. 2, there are three available frequencybands. Therefore, with the number of bands taken into account, thenumber of combinations is 189 (63×3). When categorizing process isperformed to realize all combinations, the number of categories is toolarge, and the management is complicated, thereby incurs an increasingnumber of pieces of necessary control information. To avoid this, thepresent embodiment suppresses the number of categories as illustrated inFIG. 10. In the equation above, “4”, “2”, and “1” respectively indicatethat there can be four positions at 1.25 MHz, two positions at 2.5 MHz,and one position at 5.0 MHz in the up bandwidth, for example.

MIMO is one of the wireless techniques. The MIMO is short for multipleinput multiple output, and data is transmitted/received through aplurality of antennas. Thus, as the information associated with aterminal category, as illustrated in FIG. 8, at least one of the MIMOtransmission information indicating whether or not the transmissionusing the MIMO can be performed and the MIMO reception informationindicating whether or not the reception using the MIMO can be performedcan be added as MIMO information. Otherwise, it can be added for othertype of information.

Second Embodiment

In the mobile communications, a mobile object (terminal) can move intoan area covered by a different base station. To cope with the movement,handover is carried out. When the handover is performed, at least oneassignment of the frequency resources, that is, up/down frequencies, andtheir bandwidths can be changed. The second embodiment suppresses thenumber of bits of the control information transmitted and received tochange the assignment of the frequency resources during the handover.

During the handover, a terminal has already communicated with one ormore base stations. That is, the up/down frequencies and theirbandwidths have already been assigned. With the situation taken intoaccount, the second embodiment is designed to reduce the necessarynumber of bits for control information and shorten the time required totransmit the control information.

The configurations of the terminal and the base station according to thesecond embodiment are basically the same as in the first embodiment.Therefore, the same or basically the same components as in the firstembodiment are assigned the same reference numerals, and only componentsdifferent from those in the first embodiment are described below indetail.

FIG. 12 illustrates the configuration of the wireless communicationdevice mounted in the terminal according to the second embodiment. Asillustrated in FIG. 12, further provided in addition to theconfiguration according to the first embodiment are: a received electricfield strength measurement unit 121 for measuring the received electricfield strength from the received data for each base station 51; and areceived electric field strength information generation unit 122 fornotifying the base station 51 of the measurement result by themeasurement unit 121. The generation unit 122 transmits the measurementresult to the base station 51 as the received electric field strengthinformation. The wireless terminal device according to the secondembodiment is realized by mounting in the terminal 52 the wirelesscommunication device illustrated in FIG. 12. It is the same in otherembodiments described later.

On the other hand, as illustrated in FIG. 13, in addition to theconfiguration according to the first embodiment, the base station 51 isprovided with: a received electric field strength information extractionunit 131 for extracting the received electric field strength informationreceived from the terminal 52 from received data; and a handover controlunit 132 for determining the necessity to perform handover according tothe received electric field strength information extracted by theextraction unit 131.

The handover control unit 132 is provided for the base station 51 or theradio network controller 53. By referring to the received electric fieldstrength information transmitted for each base station 51, the necessityof the handover is determined, and the determination result is notifiedto the link setting unit 87. On the basis of the notification, the basestation 51 having the largest received electric field strength isallowed to communicate with the terminal 52. Upon receipt of thenotification of the necessity of the handover, the link setting unit 87sets a link to the terminal 52 to communicate with, designates aterminal category according to the terminal capability information 66about the terminal 52, and sets the link. If the contents of the linksetting are different from the preceding contents, the controlinformation to be transmitted to the terminal 52 is transmitted to thecontrol signal generation unit 88, and a control signal is transmitted.

The following control signal is transmitted.

When the identification about the down link frequency is Nd, the downlink frequency information Nd is generated by the equation (2) above.

Similarly, when the information about the up link frequency is Nu, theup link frequency information Nu is generated by the following equationusing the down link frequency F_(DL) and the determined up linkfrequency F_(UL)

Nu=5×(F _(DL) −F _(UL))  (5)

The down link frequency information Nd requires 14 bits as describedabove. However, since the up link frequency information Nu is calculatedby the following equation although the up/down link frequencydifferences are UMTS 1.7/2.1 of the frequency band number iv at thelargest up/down link frequency difference of 490 MHz as illustrated inFIG. 2, the information can be represented by 12 bits.

Nu=5×490=2450

Therefore, as compared with the case where the up link frequencyinformation Nu is generated using the equation (2) above, the number ofbits can be reduced. By the reduction, the frequency setting accompaniedwith the link setting etc. can be performed at a high speed. Each pieceof the up link frequency information Nu and Nd is calculated by thetransmission/reception frequency calculation unit 92.

Each piece of the up link frequency information Nu and Nd is transmittedas a control signal to the terminal 52, and extracted by the controlsignal extraction unit 68. The device setting control unit 69 calculatesthe up link frequency F_(UL) from the up/down link frequency informationNu and Nd, and then calculates the down link frequency F_(DL). Thus, asetting is performed according to the control signal transmitted fromthe base station 51. The calculation of the frequencies F_(UL) andF_(DL) is performed by the transmission/reception frequency calculationunit 72 illustrated in FIG. 7.

In the present embodiment, the information generated using the equation(5) is transmitted as the down link frequency information Nd with the uplink frequency information Nu, but the inverse operation is acceptable.That is, the up link frequency information Nu is generated using theequation similar to the equation (2), and the down link frequencyinformation Nd can be generated using the equation similar to theequation (5). In addition, it is also possible for a base station todetermine one of the up and down frequencies, notifies the 52 of thedetermination, and the terminal 52 can determine the other withreference to the integrated terminal category information as illustratedin FIG. 10 and transmit a notification.

Third Embodiment

In the above-mentioned first and second embodiments, at least one of theup and down frequencies is notified directly from the base station 51 tothe terminal 52. In the third embodiment, at least one of the up anddown frequencies is predetermined as a reference, and the up and downfrequencies are notified using the determined frequency of the referenceso that the necessary number of bits for transmitting controlinformation (signal) can be smaller.

The configurations of the terminal and the base station according to thethird embodiment are basically the same as in the first embodiment.Therefore, the same or basically the same components as in the firstembodiment are assigned the same reference numerals, and only componentsdifferent from those in the first embodiment are described below indetail. In this example, as illustrated in FIG. 2, the up/down linkfrequency bands and the frequency difference between the bands arepredetermined.

In the link setting unit 87 of the base station 51, the down linkfrequency to be assigned to the terminal 52 is determined with the linkuse status etc. taken into account. In this case, a control signal isgenerated using at least one of a predetermined frequency band number orits central frequency and a difference between the central frequency andan actually determined up and down link frequency. Since the centralfrequency is used as a reference, it is hereinafter referred to as a“reference frequency”.

The frequency band numbers 1 through 9 can be represented by 4 bits. Thedifference between the reference frequency and the up link frequency canbe represented by 8 bits although 70 MHz is used as the maximum systembandwidth. In this example, the reference frequency is expressed byf_(S) _(_) _(DL), the determined down link frequency by f_(DL), thedownlink frequency information indicating the difference between thefrequencies by Nd, and the frequency information Nd is generated usingthe following equation.

Nd=2×(f _(S) _(_) _(DL) −f _(DL))  (6)

Thus, the control information indicating the down link frequency can berepresented by a total of 12 bits. Therefore, the control informationcan be transmitted by a smaller number of bits. As a result, it can beset at a speed higher than the frequency setting.

Actually, if a down link frequency band is determined on the basis ofUMTS 800 (frequency band number vi) with the central frequency of 877.5MHz, and the control information is generated using 2.5 MHz as adifference from 877.5 MHz with the reference frequency of 880 MHz as thecentral frequency, then the band number is “0110” as 6, and 2.5 MHz is“000000101” by the equation (6), and the result is “0110000000101”.

In the present embodiment, the control information is generated on thebasis of the band number+the difference of reference frequency, but theorder can be inverse. Although the difference is obtained between thereference frequency and the down link frequency, it can be obtainedbetween the reference frequency and the up link frequency. Thedifference can be generated using the following equation where Nuindicates the frequency information, f_(S) _(_) _(UL) indicates the upreference frequency, and f_(UL) indicates the determined up linkfrequency.

Nu=2×(f _(S) _(_) _(UL) −f _(UL))  (7)

Since the necessary number of bits can be reduced for the frequencyinformation Nd and Nu, any of them can be transmitted. The number ofreference frequency band or the reference frequency can be stored inadvance in a storage device.

Fourth Embodiment

In the mobile (wireless) communication, it is common that a schedulingprocess is performed by selecting a destination and determining atransmitting method. The fourth embodiment is designed to devise thescheduling.

The configurations of the terminal and the base station according to thefourth embodiment are basically the same as in the first embodiment.Therefore, as with the second and third embodiments, the same orbasically the same components as in the first embodiment are assignedthe same reference numerals, and only components different from those inthe first embodiment are described below in detail.

FIG. 14 illustrates the configuration of the wireless communicationdevice mounted in the terminal according to the fourth embodiment. Asillustrated in FIG. 14, in addition to the configuration according tothe first embodiment, the device further includes a CQI (channel qualityindicator) measurement unit 141 for measuring transmission power andinterference power upon receipt of a pilot signal transmitted from thebase station 51, calculating a SIR, and measuring a CQI information, anda CQI generation unit 142 for transmitting the measurement result to thebase station 51. The CQI generation unit 142 transmits the measurementresult of the CQI information as CQI information to the base station 51.It is transmitted on the HS-DPCCH (dedicated physical control channel(uplink) for HS-DSCH).

On the other hand, as illustrated in FIG. 15, in addition to theconfiguration according to the first embodiment, the device furtherincludes a CQI information extraction unit 151 for extracting the CQIinformation received from the terminal 52 from the received data, and ascheduler unit 152 for performing scheduling according to the CQIinformation extracted by the extraction unit 151.

The scheduler unit 152 selects the terminal 52 for transmission withreference to the CQI information extracted for each terminal 52 by theCQI information extraction unit 151, and selects a modulation system, acoding rate, a data length, a bandwidth, and an available frequency froma terminal category. The terminal category is notified as a terminalinformation signal from the terminal 52 to the base station 51, ornotified from the terminal category setting unit 101 according to theterminal capability information 66 transmitted by the terminal 52. Bytransmitting the selection result to the control signal generation unit88, the result is transmitted as a control signal to the correspondingterminal 52. To manage the terminal 52 by the terminal category(terminal capability information 66) as described above, as with thefirst embodiment, the control is simplified. The simplified processrealize s a frequency setting at a higher speed.

Fifth Embodiment

In the OFDMA, as it is well known, all subcarriers are shared by allusers (terminals 52), and a subcarrier having high transmissioncharacteristic for each user is assigned, thereby improving thefrequency use efficiency. The firth embodiment generates controlinformation by regarding the subcarriers.

The configurations of the terminal and the base station according to thefifth embodiment are basically the same as in the first embodiment.Therefore, as with the second through fourth embodiments, the same orbasically the same components as in the first embodiment are assignedthe same reference numerals, and only components different from those inthe first embodiment are described below in detail.

FIG. 16 illustrates an example of numbering to the subcarriers. In thepresent embodiment, as illustrated in FIG. 16, a subcarrier having alower frequency is assigned a smaller number. The number assigned to asubcarrier having the lowest frequency is 1. In this example, it isassumed that the base station 51 and the terminal 52 share a subcarriernumbers, the frequency of the subcarrier associated with each number,and a subcarrier bandwidth.

The link setting unit 87 at the base station 51 refers to the integratedterminal category information (FIG. 10) using a terminal categorydesignated by the terminal capability information 66 received from theterminal 52, and determines up and down bandwidths to be assigned, upand down frequencies, etc., that is, a group. In this case, for example,the number of subcarrier positioned at the center of the group from thedetermined down link frequency, and designates the number of subcarriersfrom the down bandwidth. The designation of the subcarrier number andthe number of subcarriers is similarly performed for the up linkfrequency and the up bandwidth. The thus designated subcarrier numberand number of subcarriers are notified and transmitted as controlinformation to the control signal generation unit 88. The designation ofthe subcarrier number is performed by the transmission/receptionfrequency calculation unit 92, and the designation of the number ofsubcarriers is performed by the transmission/reception bandwidthcalculation unit 93.

On the other hand, the control signal extraction unit 68 of the terminal52 extracts the control information (signal) received from the basestation 51 from the received data, and notifies the device settingcontrol unit 69 of the information. The subcarrier number and the numberof subcarriers in the control signal are transmitted to thetransmission/reception frequency calculation unit 72 and thetransmission/reception bandwidth calculation unit 73 respectively. Thus,the transmission/reception frequency calculation unit 72 calculates thefrequency corresponding to the subcarrier number, and thetransmission/reception bandwidth calculation unit 73 calculates thebandwidth corresponding to the number of subcarriers.

The subcarrier number and the number of subcarriers are recognized ascontrol information (signal) so that the resources can be arbitrarilyassigned to each subcarrier. The necessary number of bits inrepresenting the subcarrier number and number of subcarriers depends onthe total number of subcarriers. However, since the frequency and thebandwidth can be separately managed by the subcarrier number and thenumber of subcarriers, control can be easily performed. Thus, thefrequency setting can be performed at a high speed.

In the present embodiment, the combination of the subcarrier number andthe number of subcarriers is transmitted as a control signal, butanother combination is available. For example, the frequency can replacethe subcarrier number. Otherwise, as in the third embodiment, areference frequency is predetermined, and a difference from thereference frequency can be adopted. In addition, as illustrated in FIG.17, a plurality of subcarriers can be grouped, each group is assigned aunique number, and a combination of a subcarrier number and a groupnumber can be transmitted as a control signal. Since the frequencybandwidth assigned to each group and the position on the frequency axisare normally unique, only the group number can be transmitted as acontrol signal. Although only the group number is notified, thefrequency bandwidth and the information for designation of the positioncan be prepared at the terminal 52 for each group, thereby allowing theterminal 52 to designate the corresponding frequency bandwidth and theposition according to the group information. Thus, the informationadopted as a control signal can come in variations. The control signalcan be transmitted during link setting, and also can be transmitted whena transmission terminal is determined by scheduling.

Sixth Embodiment

In the mobile communications, a cell can be selected during link settingand during handover, and synchronization can be performed during standbyusing the central frequency of a bandwidth available in a base station.In this case, a predetermined frequency (for example, the centralfrequency of a system frequency band hereinafter referred to as a“initial use frequency”) is used for a CPICH (common pilot channel) fortransmitting a common pilot signal from a base station, a SCH(synchronization channel) for transmitting a synchronization signal, aPCH (paging channel) for transmitting a standby signal, a BCH (broadcastchannel) for transmitting system information, and a PICH (pagingindicator channel) for notifying the presence/absence of a receivedsignal. A predetermined bandwidth (hereinafter referred to as a “initialuse frequency band”) is used for a transmission from a base station to aterminal. The sixth embodiment is designed to generate controlinformation with the consideration above.

The configurations of the terminal and the base station according to thesixth embodiment are basically the same as in the first embodiment.Therefore, as with the second through fifth embodiments, the same orbasically the same components as in the first embodiment are assignedthe same reference numerals, and only components different from those inthe first embodiment are described below in detail.

The frequency and the bandwidth used in transmitting each of theabove-mentioned signals are transmitted from the base station 51 to theterminal 52 using the PCH etc. The transmission is performed bygenerating a control signal as described above with reference to thesecond embodiment. The initial use frequency and the initial usebandwidth can be stored at the terminal in advance.

When a frequency band is moved after establishing a wireless channel,the central frequency of a frequency band is used in transmitting thesignal before the movement. In the sixth embodiment, a control signal isgenerated and transmitted by using the central frequency as a referencefrequency as in the third embodiment. Thus, a frequency can be easilyset at a high speed by reducing the necessary number of bits for acontrol signal. FIG. 19 is an explanatory view of the state in which anavailable frequency band is moved.

In the present embodiments (first through sixth embodiments), the linksetting unit 87 and the scheduler unit 152 at the base station (wirelesscommunication system) and the device setting control unit 69 of theterminal 52 are realized by a CPU for executing a program or a DSP etc.In some existing wireless communication systems or terminals, thepresent invention can be applied by changing the program executed by aCPU, a DSP, etc. Thus, a program for realizing the wirelesscommunication system or the terminal according to the present inventioncan be prepared, and the program can be recorded on a record medium suchas flash memory, CD-ROM, etc. and then distributed. It can bedistributed through a communication network.

What is claimed is:
 1. A wireless communication system comprising: aterminal capability information reception unit to receive and extractterminal capability information, the terminal capability informationindicating at least one of an uplink frequency bandwidth as a capabilityof a wireless terminal device and a downlink frequency bandwidth as acapability of the wireless terminal device; a terminal category settingunit to identify a terminal category to which the wireless terminaldevice belongs, based on the terminal capability information; and a linksetting unit to set a link between a base station and the wirelessterminal device and to transmit a control signal depending on the linksetting between the base station and the wireless terminal device, basedon the terminal category set by the terminal category setting unit.
 2. Awireless communication system comprising: a terminal capabilityinformation reception unit to receive and extract terminal capabilityinformation, the terminal capability information indicating at least oneof an uplink frequency bandwidth as a capability of a wireless terminaldevice and a downlink frequency bandwidth as a capability of thewireless terminal device; a terminal category setting unit to identify aterminal category to which the wireless terminal device belongs, basedon the terminal capability information; and a scheduling unit toschedule on a basis of the terminal category set by the terminalcategory setting unit for selecting a wireless terminal device tocommunicate with from among wireless terminal devices.
 3. A wirelesscommunication system comprising: a terminal capability informationreception unit to receive and extract terminal capability information,the terminal capability information indicating at least one of an uplinkfrequency bandwidth as a capability of a wireless terminal device and adownlink frequency bandwidth as a capability of the wireless terminaldevice; and a link setting unit to set a link between a base station andthe wireless terminal device according to the terminal capabilityinformation, and transmit a control signal corresponding to the linksetting between the base station and the wireless terminal device.
 4. Awireless communication system comprising: a terminal capabilityinformation reception unit to receive and extract terminal capabilityinformation and indicating a terminal category to which a the wirelessterminal device belongs, the terminal capability information indicatingat least one of an uplink frequency bandwidth as a capability of awireless terminal device and a downlink frequency bandwidth as acapability of the wireless terminal device; and a scheduling unit toschedule according to the terminal capability information received andextracted by the terminal capability information reception unit forselecting a wireless terminal device to communicate with from amongwireless terminal devices.
 5. A wireless base station, comprising: aterminal capability information reception unit to receive the terminalcapability information indicating at least one of an uplink frequencybandwidth as a capability of a wireless terminal device and a downlinkfrequency bandwidth as a capability of the wireless terminal device; anda link setting unit to set a link between a base station and thewireless terminal device according to the terminal capabilityinformation, and transmit a control signal corresponding to the linksetting between the base station and the wireless terminal device.
 6. Awireless base station, comprising: a terminal capability informationreception unit to receive and extract terminal capability informationand indicating a terminal category to which a the wireless terminaldevice belongs, the terminal capability information indicating at leastone of an uplink frequency bandwidth as a capability of a wirelessterminal device and a downlink frequency bandwidth as a capability ofthe wireless terminal device; and a scheduling unit to scheduleaccording to the terminal capability information received and extractedby the terminal capability information reception unit for selecting awireless terminal device to communicate with from among wirelessterminal devices.
 7. A wireless terminal device, comprising: a terminalcategory setting unit to identify a terminal category to which wirelessterminal belongs, based on at least one of an uplink frequency bandwidthas a capability of a wireless terminal device and a downlink frequencybandwidth as a capability of the wireless terminal device; and acategory transmitting unit to transmit the terminal category to a basestation.
 8. The wireless terminal device according to claim 7, furthercomprising: a unit configured to receive a control signal depending on alink setting between the base station and the wireless terminal device,based on said identified terminal category.